Practical comparison of 2.7μm fused-core silica particles and porous sub-2μm particles for fast separations in pharmaceutical process development

2010 ◽  
Vol 51 (1) ◽  
pp. 131-137 ◽  
Author(s):  
Ahmed Abrahim ◽  
Mohammad Al-Sayah ◽  
Peter Skrdla ◽  
Yuri Bereznitski ◽  
Yadan Chen ◽  
...  
Author(s):  
V. V. Damiano ◽  
R. P. Daniele ◽  
H. T. Tucker ◽  
J. H. Dauber

An important example of intracellular particles is encountered in silicosis where alveolar macrophages ingest inspired silica particles. The quantitation of the silica uptake by these cells may be a potentially useful method for monitoring silica exposure. Accurate quantitative analysis of ingested silica by phagocytic cells is difficult because the particles are frequently small, irregularly shaped and cannot be visualized within the cells. Semiquantitative methods which make use of particles of known size, shape and composition as calibration standards may be the most direct and simplest approach to undertake. The present paper describes an empirical method in which glass microspheres were used as a model to show how the ratio of the silicon Kα peak X-ray intensity from the microspheres to that of a bulk sample of the same composition correlated to the mass of the microsphere contained within the cell. Irregular shaped silica particles were also analyzed and a calibration curve was generated from these data.


Author(s):  
P. B. Basham ◽  
H. L. Tsai

The use of transmission electron microscopy (TEM) to support process development of advanced microelectronic devices is often challenged by a large amount of samples submitted from wafer fabrication areas and specific-spot analysis. Improving the TEM sample preparation techniques for a fast turnaround time is critical in order to provide a timely support for customers and improve the utilization of TEM. For the specific-area sample preparation, a technique which can be easily prepared with the least amount of effort is preferred. For these reasons, we have developed several techniques which have greatly facilitated the TEM sample preparation.For specific-area analysis, the use of a copper grid with a small hole is found to be very useful. With this small-hole grid technique, TEM sample preparation can be proceeded by well-established conventional methods. The sample is first polished to the area of interest, which is then carefully positioned inside the hole. This polished side is placed against the grid by epoxy Fig. 1 is an optical image of a TEM cross-section after dimpling to light transmission.


Author(s):  
C.K. Wu ◽  
P. Chang ◽  
N. Godinho

Recently, the use of refractory metal silicides as low resistivity, high temperature and high oxidation resistance gate materials in large scale integrated circuits (LSI) has become an important approach in advanced MOS process development (1). This research is a systematic study on the structure and properties of molybdenum silicide thin film and its applicability to high performance LSI fabrication.


2015 ◽  
Vol 3 (1) ◽  
Author(s):  
Fernando Pacheco Olea ◽  
Carolina Villacís ◽  
Patricio Álvarez Muñoz

Este artículo es producto de una investigación que tiene como finalidad establecer la relación que tienen las TIC con el rendimiento académico de los estudiantes del Colegio Técnico Industrial “La Alborada” de la ciudad de Milagro, provincia del Guayas, Ecuador. Este estudio se enmarca dentro de las investigaciones descriptivas, correlacionales, ya que por medio del análisis, observación, comparación y descripción de las variables, se establece el escaso uso de las herramientas tecnológicas en el proceso educativo. Los datos estadísticos se obtienen de los resultados por la aplicación de instrumentos a los estudiantes y docentes de la institución. Se utilizaron los métodos deductivos, inductivos y teóricos para el desarrollo del proceso. La propuesta requiere un fortalecimiento en el uso de las nuevas tecnologías de la Información y Comunicación, siendo importante que los docentes conozcan el uso adecuado de las mismas y las integren en sus horas de clases, porque mejorará el rendimiento académico de los estudiantes por su nueva forma de explicar las clases que serán más interactivas y divertidas. Es necesario realizar un Plan de capacitación en el uso de las herramientas e- learning que garantice una educación de calidad.   Palabras claves: TIC, rendimiento académico, proceso educativo.   ABSTRACT   This article is the result of a research that aims to establish the relationship of ICTs to academic performance of students in the Industrial Technical College “La Alborada” in Milagro, Guayas, Ecuador. This study is part of a descriptive, correlational research, since through analysis, observation, comparison and description of the variables, the limited use of technological tool sin the educational process is established. The statistics are obtained from the resultsof the application of tools for students and teachers of the institution. Deductive, inductive and theoretical process development methods were used. The proposal requires as treng then ing in the use of new information and communication technologies and it is important that teachers become aware of their proper use and incorporate them in their classes, because these will improve the academic performance of students in classes that are more interactive and fun. It’s necessary to design a training plan in the use ofe-learning tools to ensure quality education.   Keywords: TIC, academic achievement, educational process.   Recibido: febrero 2015Aprobado: mayo 2015


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